Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
health incidence » death incidence, health incident, health science
health impedance » health importance, health temperance, head impedance

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( health incidence ((networks synthesis) OR (network systems)) report ) OR ( health impedance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( health incidence ((networks synthesis) or (network systems)) report ) or ( health impedance network synthesis report ))*.